This blog will cover topics for an introductory physics course.  Most of the blog posts will be comments, hints, and tips to help students understand topics taught during a full year of introductory physics classes.  The blog posts will follow the outline of topics of the OpenStax College Physics textbook.  You can get your pdf copy of this FREE textbook at https://openstax.org/details/college-physics .   I taught physics and astronomy at Dickinson College (Carlisle, PA) for four years.  I taught physics, astronomy, mathematics, and computer science at Midland University (Fremont, NE) for 32 years.  I enjoy helping others learn about physics and astronomy.  I have over 400 physics and astronomy videos posted on YouTube.  The videos include lectures and solutions for example problems.  The videos are indexed at  physics.gpclements.com and astronomy.gpclements.com (soon). Prof. Greg Clements